Rating the Ratings: CBS' three-night summer reality franchise had another very healthy campaign, barely inching up in Plus on all three nights. It was one of the many veteran unscripted series to post a new series high this summer, though its growth was not nearly as drastic as The Bachelorette, American Ninja Warrior and even America's Got Talent. But as the rose has come off the bloom somewhat for CBS' push into original dramas during the summer, Big Bro is becoming ever more valuable. Grade: B+.